variable cycle engine

例句：

1. 1. Thevariable-cycle engine is a type of internal combustion engine that can vary the number of cylinders it uses to achieve different power outputs.
   可变循环发动机是一种内燃机，它可以根据需要改变使用的气缸数量以实现不同的功率输出。
2. 2. In the variable-cycle engine, the piston moves up and down in response to the changing load conditions,allowing for efficient use of fuel and energy.
   在可变循环发动机中，活塞根据负载条件的变化上下移动，从而实现燃料和能量的高效使用。
3. 3. The variable-cycle engine has become increasingly popular in recent years due to its ability to reduce emissions and improve efficiency.
   由于其减少排放和提高效率的能力，近年来可变循环发动机越来越受欢迎。